Device for feeding additional oxygen to freely portable breathing implements



Sept. l5, 1931. A. H. l.. CHRISTENSEN 1,823,785

DEVICE FOR FEEDING ADDITIONAL OXYGEN TO FREELY PORTABLE BREATHING IMPLEMENTS Filed June 25, 1929 A. H. L. CHR\STEN$EN Patented Sept. 15, 1931 UNITED STATES PATENT OFFICE ALFRED HEINRICH LORENZ CHRISTENSEN, 0F LBECK, GERMANY, ASSIGNOR TO OTTO HEINRICH DRGER, OF LBECK, GERMANY DEVICE FOR FEEDING ADDITIONAL OXYGEN T0 FREELY PORTABLE BREATHING IMPLEMENTS Application filed June 25,` 1929, Serial No. 373,530, and in Germany July 5, 1928.

The present invention relates to devices for feeding additional oxygen to freely portable breathing implements, in which a bypass leading from the reduction valve and which is adapted to be shut, orf from the oxygen reservoir by a valve, consists of a low pressure pipe member and a high pressure pipe member situated within the low pressure pipe member and connected to the same by an automatically closing pressure button valve, the mounting of both pipe members carrying the pressure gauge (volumenometer).

The known arrangements of this character have the disadvantage that the pressure gauge is connected to a branch pipe of the high pressure pipe of the by-pass, so that the high pressure pipe of the by-pass is completely closed of from the oxygen supply when the pressure gauge becomes broken or out of order and its connection with the oxygen source must be closed. The valve which cuts out the pressure gauge also closes oif the by-pass from the oxygen source. However, it is highly desirable that the by-pass still be connected to the oxygen source even though the pressure gauge be broken or injured to the extent that it might allow the leakage of oxygen. The remainder of the breathing implement might still be capable of normal operation.

According t0 the present invention the disadvantages explained above are overcome by providing two high pressure pipe members one of these forming a part of the by-pass while the other leads to the pressure gauge and is adapted to be shut off from the oxygen reservoir by a valve which does not influence the first mentioned high pressure pipe. Thus the pressure gauge may be cut off separately without the operation of the by-pass being discontinued.

Figs. 1 and 2 of the drawings are longitudinal sections of the two end pieces of the device constructed according to the invention.

The high pressure pipe 1, which may be fed from a suitable oxygen source or reservoir (not shown) is connected with the pressure reduction valve 2, which in well known manner allows oxygen to be fed into the breathing circuit of the implement at predetermined amounts. The high pressure pipe 1 communicates directly with the inner space of the chamber 3 to which a nipple 6 is connected by means of a screw cap 5 attached to the exteriorly threaded end portion 4. The nipple 6 is connected with the Casing 9 which carries the pressure gauge 8, by means of a flexible pipe 7. The end wall of the chamber 3 on the left hand side of Fig. 2 and the nipple 6 lying adjacent thereto, are provided with coacting bores or channels 10 and 11 forming passageways connecting the high pressure pipes 12 and 13 with the inner space of chamber 3. These high pressure pipes are wound about a core 14 formed of rope or other iiexible material. One end of the core is held in a suitable recess 15 of the nipple 6 whereas its other end is held in a recess 16 of the plug 17. A portion of this plug 17 is arranged in the casing 9 and has a threaded connection 18 with the nipple 19. A channel 20 in the nipple 19 forms a continuation of the high pressure pipe 13 and termif nates at the mouth 21. The mouth of the channel 2O is adapted to be closed by a push button valve. the valve seat 22 being connected by a lever 23 with a push button 24 and normally held in closed position by a spring 25. The high pressure pipe 12 communicates with a channel 26 joining a branch channel 27 in the nipple 19, these channels communicating with the pressure gauge 8. The push button valve is surrounded by a casing 28 within which low pressure prevails when the valve 22 has been opened, this low pressure being due to the reduction in pressure to which the oxygen is subjected when flowing from the narrow mouth of channel 20 into the comparatively large casing 28. The casing 28 communicates with the inside of the flexible pipe 7 by a channel 29. Through passageway 3() and the nipple (i. the pipe 7 moreover communicates with the connecting hose 31 leading to the breathing circuit.

As will be understood from Fig. 2, the high pressure channels 10 and 11 terminate in the chamber 3 in such manner that only ino the high pressure channel l() which communicates with the pressure gauge can be closed by the valve 32 adapted to be screwed down within the casing 3. This valve 3Q can be operatedinany well known manner, for instance by mea-ns vof a hand lever applied to a portion 34 of the valve spindle 35 having a square cross section and which is operatively connected with the valve 32 by an intermediate plate member 36. In other re- Spects the valve is known per se and is therefore not described in further detail.

I claim:

1. The combination with a freely portable breathing implement consisting of a breathing circuit, ya source of oxygen, a pressure reducing valve, and vmeans for feeding oxygen into said breathing circuit through said pressure reducing valve, of means for feeding-additional oxygen to the breathing circuit land for indicating the pressure of the oxygen supply, said means comprising a byhaving a low pressure conduit and a high pressure conduit disposed within said low vpressure conduit, the high pressure conduit being in connnunication with the oxygen source, a push button valve connecting the low pressure conduit and the high pressure conduit of the by-pass, a passageway fleading from the said low pressure conduit to the breathing circuit, a pressure gauge mounted on the by-pass, a second high pressure conduitdisposed within said low pressure conduit and communicating at one end with the oxygen source and at its other end with said pressure gauge7 and a valve adapted to close off said second high pressure conduit from the source of oxygen supply. the high pressure conduit constituting a part of the yby-pass being in communication with the oxygen when the last ymentioned valve is in closed position.

2. The combination with a freely portable breathing implement consisting of a breathyfing circuit, a source of oxygen, a pressure reducing Valve,and means for feeding oxygen into said breathing circuit through said pressure reducing valve, of means for feeding additional oxygen to the breathing circuit, and for indicating the pressure of the oxygen supply, said means comprising a byconsisting of a low pressure conduit of fiexible .material and a high pressure conduit of small diameter than said low pressure conduit and disposed within the same, a push button valve connecting the high pressure vand low pressure conduits, said high pressure conduit being in direct communication with the oxygen source, a passageway leading from the low pressure conduit to the breathing'circuit, a pressure gauge mounted on said by-pass adjacent the push button valve, a second high pressure conduit also dis- Iposed within said klow pressure conduit commnnicating with said pressure gauge, at one 

